Transflective LCD Pixel Structure Single Cell Gap Gamma Consistency
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Solution Overview
Problem
Conventional transflective liquid crystal display (TR-LCD) panels with a single cell gap face challenges in optimizing optical efficiency due to differing light path differences between reflective and transmissive regions, leading to inconsistent gamma curves and increased manufacturing complexity and cost.
Innovation Solution
A pixel structure for TR-LCD panels is designed with a single cell gap, incorporating a coupling capacitor and a modulating capacitor electrically connected to the reflection electrode, which allows for similar gamma curves in both transmission and reflection regions, reducing manufacturing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single cell gap structure is used in TR-LCD panels, then the manufacturing process is simplified and production cost is reduced, but the gamma curves of reflection and transmission regions become inconsistent leading to suboptimal optical efficiency
Solution Approach 1:
The patent introduces different cell gap parameters for reflection and transmission regions by forming a first spacer pattern with a first cell gap in the reflection region and a second spacer pattern with a second cell gap in the transmission region. This parameter differentiation allows each region to have optimized optical characteristics while maintaining a single manufacturing process flow, resolving the contradiction between manufacturing simplicity and optical performance consistency.
2Reliability
If additional bumps are arranged in the reflection region to achieve dual cell gap, then consistent gamma curves are obtained, but the manufacturing process complexity and production cost increase
Solution Approach 1:
The patent segments the spacer structure into two distinct patterns: a first spacer pattern for the reflection region with a first cell gap, and a second spacer pattern for the transmission region with a second cell gap. This segmentation allows different optical characteristics in different regions without requiring additional bumps or complex dual-gap structures, thereby maintaining manufacturing simplicity while achieving gamma curve consistency.
3Reliability
If the cell gap of reflection region is made half of transmission region in dual cell gap panel, then light path differences are equalized, but additional manufacturing steps are required
Solution Approach 1:
The patent merges the dual cell gap functionality into a single manufacturing process by forming both the first spacer pattern and second spacer pattern in the same fabrication sequence. The different cell gaps are achieved through pattern design rather than additional processing steps, combining the benefits of dual-gap optical performance with single-process manufacturing simplicity.
Data Source
AI summary
A pixel structure of a transflective liquid crystal display panel. The pixel structure has single cell gap design, but a coupling capacitor and a modulating capacitor are properly connected to the reflection electrode so as to modulate the voltage of the reflection electrode. Consequently, the transmission region and reflection region of the pixel structure have substantially consistent gamma curves.